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posterior diplosome. Examples of these forms are : 



1. C. fasciculata (Leger), in the gut of Anophe- 

 lines, also in the larvae and pupae. (Crithidia forms are 

 very common in the rectum of mosquitoes in the 

 tropics.) Two forms occur: (a) small form, 3*5 by 2/4; 

 (b) large form, 7 by 3/4. 



2. C. minuta. In 7 ' abanus tergestinus, shows 

 , a ' and ' b ' forms. 



Fig. ill. (i) C. fasciculata; (2) C. minuta; ($) H.culicis ; 

 (4) //. subulata 



3. C. subulata. In the gut of Tabanidae. 



4. C. campanulata. In the larva of Chironomus 

 -plumosus. 



Herpetomonas. Body spindle-shaped, i.e., tapering 

 at both ends, with an ovoid nucleus centrally placed 

 and a long sausage-shaped blepharoplast placed 

 anteriorly. From this proceed two rod-like rhizoblasts, 

 and at the end of these occur two granular points 

 (diplosome). From these arise two flagella, which are 

 united by a membrane. This double flagellum is not 



